Milling machine attachment for lathes



May 15, 1945. W.C.HUNGERFORD 2,375,789

MILLING MACHINE ATTACHMENT FOR LATHES Filed Jan. 4, 1939 2 Sheets-Sheet l m l l ll ll illlllt gig "I'll 3 4 MZAAD c/l uwiefv/ea ATTORNEY May 15, 1945. w. c. HUNGERFORD 2,375,789

MILLIN G MACHINE ATTACHMENT FOR LATHES Filed Jan. 4, 1959 ZSheets-Sheet 2 INVENTUR. /LM/0 dfrwaaewoea 7 By I ATTORNEY Patented May 15, 1945 Willard c. Hungerford, Lol ms, cam.

' Application Jamaal-r4, 1939, Sfial (Cl. 90- l '14 Claims.

I My invention relates to a milling machine attachment for lathes.

One of the principal objects of this invention is to provide an attachment of this'class which is particularly simple and economical to make, which may be easily and quickly installed without the least mutilation of the lathe, and which is simple to operate.

Another important object of this invention is to provide an attachment of this class for a conventional lathe whereby, the combination may provide and simulate as nearly as possible the lathe on which my is installed;

Fig. 2 is a fragmentary elevation thereof;

Fig. 2 is a fragmentary view in plan, taken at 2a 01 Fig. 3 is an enlarged sectional view showing particularly the means for taking up the slack,

in a slightly modified form;

Fig. 4 is a sectional view thereof taken through milling machine attachment 4-4 of Fi 3:

several adjustments of the conventional milling machine, and whereby the conventional lathe adjustments are utilized and only one adjustment supplied by my attachment.

An object of my invention is to provide an attachment whereby the work, to be operated on, may be rigidly supported by and secured to the adjustable lathe carriage, and whereby the at- "tachment will supply the vertical adjustment of the cutter or other tool for the on the work.

An object also of this invention is to provide a vertically adjustable cutter or tool which is de-. tachably operatively connected to the headstock spindle of the lathe, and in which the connection required operation is flexible and efficient.

A further object of thisinvention is to provide a novel, simple, and efllcient means of mounting an idler roller for taking up the slack of the driving belt when operating in either direction.-

Astill further object of this invention is to provide novel and simple means of supporting on the tailstock spindle, or guiding by means of such spindle, the free end of'a long cutter arbor of the attachment.

Also an object of this invention is to provide a very simple means of easily and quickly connectmg anattachment of this class to the headstock spindle of the lathe. and also for easily and quickly removing the same from such spindle.

With these and other objects in view as will 4 appear hereinafter, I have devised a milling machine attachment for lathes and one which consists in certain novel features of construction, combination, and arrangement, of parts and portions, as wi l be hereinafter described in detail and particularly set forth in the appended c reference being had to the accompanying drawings and to the characters of reference thereon, which form a part of this application, in which:

Fig; 1 is a fragmentary front elevation of a Fig. 5 is a fragmentary front elevation showing a work-holding vise on the cross-feed of the lathe; Fig. 6 is an enlarged section, taken at 6--6 of Fig. 1, showing the operative connection between the cross-feed and the lead screw of the lathe; Fig. '7 is an elevational view, partly in section,

of the out-board bearing of the cutter arbor; and,

Fig. 8 shows a modified connection between the 20 headstock spindle and the cutter spindle; and,

Fig. 9 is a fragmentary front elevation of my attachment in a slightly modified form of construction.

The lathe upon which my milling machine attachment is to be applied is preferably of the type, commonhr known as the engine lathe. This lathe, as shown in the drawings, comprises a bed l, a headstock 2, a headstock-spindle 3, a tails stock 4 which is slidably mounted on the bed, atailstock spindle 5 adjustably mounted in the tailstock, a carriage 6 slidably mounted on the ways I of the bed between the headstock and the tailstock. The usual lead screw 1 may be connected, through the split collar 8, to the carriage for automatically shifting the carriage on the ways of the bed.

On the carriage 6 are ways I l, extending crosswise of the lathe, upon which the cross-feed car- .riage of the lathe is usually mounted; and which may be automatically moved crosswise by'a crossfeed screw [2. In'my attachment I have provided a work-supporting table it which is slid- -ably mounted on the ways II and which is pro- 5 vided with a downwardly" extending lug I! throu h which the cross-feed screw l2 extends for moving the work-supporting table crosswise of the lathe. This table I3 is provided at'the upper face with T-slots. On this table is'sup- Ported the work W which is to bemachined or otherwise operated on, and which is held in place on thetable by T-bolts l4.

InFig.5Ihaveshownavise liwhichmaybe supportedontheways ll inplace of theusual angle feed, or compound rest, so that the desired .a worm |6 which is longitudinally slidable but non-rotatably mounted on the lead screw. The worm may be shifted with the carriage 6 by portions '6 at the opposite sides of the worm. This worm has a key Ili which slides in a keyway l of the screw 1. A worm gear meshes with the worm. A gear I8 is operatively connected, in any suitable manner, to a gear i9 on the cross-feed screw l2. The gears I1 and I8 are coaxial and are connected together by a clutch 20, which may be manually operated by a hand wheel 2|) from the front of the apron of the carriage 6.

. In my milling machine attachment, I have provided a bracket 2| which is supported on the lathe bed I between the headstock 2 and the carriage 6, and aligned by the ways on the bed. This bracket 2| is preferably secured to the bed in a convenient manner, such as usually employed in securing the tailstock to the bed; Thebracket 2| extends upwardly from the bed and has vertical ways 2| upon which the cutter spindle car- 'riage 22 is mounted. This cutter spindle carriage is raised and lowered by means of a manually adjustable screw 23'having a hand wheel 24 at its upper. end. This carriage carries a horizontal spindle 25 which is parallel to the center axis line of the lathe. This spindle 25 is mounted to be raised and lowered below and above the headstock spindle axis and may be positioned in front of or backwardly from the vertical plane passing through the headstock spindle axis, but preferably in front of the same, as shown. on the end of the cutter spindle 25 nearest the lathe carriage 6, is mounted the desired tool or cutter 26. On the opposite end of the cutter spindle is a sheave 21 for operating the cutter spindle.

On the bracket 2| is an adjustable backwardly but upwardly extending arm 28 which carries a counter shaft or axle 29 having rotatably mounted thereon a pair of sheaves 30 and 3|, secured together as a unitary member, the former being coplanar with the sheave 21. These sheaves 21 and 30 are connected .by a V-belt 32. The sheave 3| is connected by a belt- 33 with a sheave 34 which is mounted on the extended end of the headstock spindle 3. Thus, the revoluble movement of the headstock spindle is transmitted .the shaft or axle 29, as shown. 0n the arm 28 and around the axle 29 is provided a coil spring 31 whichbears against the arm 36 for forcing the same against the belt 32. I

The mechanism is so arranged that when the direction of rotation of the spindle 25 is reversed, the roller 35 automaticallyshifts to the side of the upper portion-of the belt and drops upon the lower portion, and in this manner keeps the belt taut, as shown by dotted lines in Fig. 2.

In Fig. 3 of the drawings I have shown a belt tightening means comprising primarily also a roller 35 at the end of an arm 38. But between the hub of the arm 36 and the sheave 30 is a friction washer 38. The sheave 30 and the arm 36 are resiliently forced .together by a spring 39 placed between the sheave 3| and a nut 29 at the outer end of the axle 29, As the sheave is rotated in one direction or the other, the arm 36 is rotated in the same direction and the roller at the end of the arm is forced to engage the corresponding portion of the belt.

If desired spring means may be provided to force the roller more tightly against the belt. This spring means may consist of two springs 40 and 4| connected at one end to the side of the arm 28. The outer ends of the springs are connected to one end of the dogs 42 and 43, respecthe ends of the dogs. The springs hold the dogs in either of two positions. When the arm 36 swings from the bottom'to the top, it is forced hard against the short arm 43 of the dog 43, ac-

centuated by the fact that the belt at the lower I side is suddenly straightened which gives the arm 36 an initial thrust to swing it in its other extreme position, and thus causing it to be forced into the position shown. It then strikesthe longer nor mally inner arm and causes it to rotate and assume the position-shown in Fig. 4. The spring 40 will draw it inwardly by reason of the slot and resiliently hold the roller 35 against the upper portion of the belt 32.

In Fig. 8 of the drawings, I have shown a slightly modified form of construction for operating the cutter spindle 25 by the headstock spindle 3. The modified structure consists of universal joints 5| and 52 connected respectively I to the headstock and cutter spindles, and a telescoping rod 53 connecting the universal joints. Such modified structure, however, is not as effective because the cutter spindle supporting bracket 2| cannot be placed very close to the headstock, and therefore does not permit as much operating space between the cutter 26 and the work W on the lathe carriage.

If, instead of the short cutter spindle 25, along cutter spindle or arbor 6| is employed, the free end of the arbor is supported in a transversely adjustable arbor journal 62, which is preferably constructed to receive the whole of the free end of the arbor. This journal is slidably mounted on a vertical slide 63* of a bracket 63. As shown in the drawings, this bracket is frictionally clamped, by

erably in a vertical direction, and the lower end is guided, preferably by a bifurcated arm 63, on the ways I of the lathe bed. In this manner, the bracket 63 may be adjusted, longitudinally of the lathe, by the tailstock spindle. The journal 62 is secured to the face of the slide portion 63- by T-bolts 64 These bolts are preferably loosely fitted in a T-slot 63 so as to provide ready vertical adjustment to accommodate slight misalinement of the tailstock with respect to the cutter arbor.

The journel 62- is then secured by the T-bolts.

The cutter 26, and also the cutter arbor 8| (that is, if a cutter arbor is used independently of the spindle 25) havetapered shanks 26- whereby they may be readily secured to the spindle 25. In this manner, the arbor Bl may be readily raised andlowered with the cutter spindle 25, that is, if the arbor journal 62' is loose on the bracket 53.

In Fig. 9 of the drawings, I have shown the cutter spindle and cutter, designated respectively, H and 12, arranged on a vertical axis, and also mounted to slide in a vertical direction. The spindle is mounted in a bracket 13, which, in this instance, is positioned at the side of the supporting bracket 2|, opposite the headstock,.instead of in front of the same as in the structure described above. The carriage l3 israised and lowered in a similar manner by a hand wheel 74 at the top of the bracket 2|, This bracket carries a sheave l5, co-a'xial with the spindle I I, and is mounted on an arm 16. At the side of the bracket 2| nearest the headstock is a pair of coaxial idler sheaves 11 mounted on an axis transverse to the cutter spindle. In this instance, the headstock spindle also has a sheave 34. A V-belt 18 extends around the sheaves 34 and and over the idler sheaves 11 for transmitting a horizontal rotation to a vertical rotation of the 'cutter spindle. The upper end of the cutter spindle is splined with respect to the sheave 15 so that it may be freely raised and lowered while being rotated.

clamped to the tailstock spindle, and having a transverse guide with an adjustable arbor hearing slidably mounted in the guide for supporting the free end of the arbor, and a cutter on the cutter arbor for operating on the work supported onthe lathe carriage. Y

3. In a milling machine attachment for lathes. the combination with a lathe having a bed, a headstock spindle at one end of the bed, a tailstock spindle, and an adjustable carriage movably mounted on the bed, of a work supporting means mountable on and adjustable by the carriage, a bracket securable to the bed of the lathe between the headstock spindle and the carriage, a cutter supporting carriage vertically slidable on the bracket, means for vertically adjusting the latter carriage, a cutter arbor revolubly mounted on the latter carriage, means operatively connecting the cutter arbor to the headstock spindle in such a manner that the cutter arbor may be freely adjusted vertically, a second bracket supported with respect to the tailstock spindle, and slidably The work W, upn which the cutter 12 may operate, above.

Though I have shown and described a particuis supported in the manner described lar construction, combination, and arrangement,-

of parts and portions of my milling machine attachment for lathes, and certain modifications thereof, I do not wish to be limited to thesame, but desire to include in,the scope of my invention the construction, combination, and arrangement, substantially as set forth in the appended claims.

I claim:

1. In a milling machineattachment for lathes,

the combination with a lathe having a bed, a

headstock spindle at one end of the bed, a tailstock spindle, and an adjustable carriage movably mounted on the bed, of a work supporting means mountable on and adjustable by the carriage, a bracket securable to the bed of the lathe between the headstock spindle and the-carriage, a cutter supporting carriage vertically slidable on the bracket; means for vertically adjusting the guided on the bed, and having a transverse guide with an adjustable arbor bearing slidably mounted in the guide for supporting the free end of the arbor, and a cutter on thecutter arbor for operating on the work supported on the lathe carriage.

4. In a milling machine attachment for lathes, the combination with a lathe having a bed, a headstock spindle at one end 6f the bed, :a tailstock spindle, and an adjustable carriage movably mounted on the bed, of a wo'rlg supporting means mountable on and adjustable by the carriage, a bracket securable to the bed of the lathe between. the headstock spindle and the carriage, a cutter supporting carriage vertically slidably on the bracket, means for vertically adjusting the latter carriage, a cutter arbor revolubly mounted on the latter carriage,fa sheave on the headstock spindle, a sheave on one end of the cutter spindle, a counter shaft carrying a pair of sheaves,

.' a belt connecting one of said pair of sheaves with having a transverse guide with an adjustable arbor bearing slidably mounted in the guide for supporting the free end of the arbor, and a cutter on the cutter arbor for operating on the-work supported on the lathe carriage.

2. In a milling machine attachment for lathes, the combination with a lathe having a bed, a

headstock spindle at one end of the bed,a-taildle in such a manner that the cutter arbor may I be'treely adjusted vertically, a second bracket slidable on the bracket, means for vertically adthe free end of the arbor, and a cutter on the a cutter arbor or operating on the work supported on the lathe carriage.

5. In a milling. machine attachment for lathes, the combination with a lathe having a bed, a headstock spindle at one end of the bed, a bracket securable to the bed of the lathe adjacent the headstockspindle, a cutter carriage vertically justing the latter carriage, a cutter spindle revolubly mounted on the latter carriage, a sheave on the headstock spindle, a sheave on one end of the cutter spindle, a counter shaft carrying" a pair of sheaves, a belt connecting one of said pair of sheaves with the headstock spindle sheave, a second belt connecting the other of said pair of sheaves with the cutter spindle sheave, an idler sheave for tightening the latter belt, and a cutbet on. the cutter spindle for operating on the worksupported on the lathe carriage.

6; In a milling machine attachment for lathes, the combination with a lathe having a bed, a headstock spindle at one end of the bed, a tailstock spindle, and an adjustable carriage movably mounted on the bed, of a work supporting means. mountable on and adjustable by the carriage, a cutter arbor revolubly supported on the bed on an axis parallel to the headstock spindle and operatively connected to the latter spindle, and a bracket supported with respect to the tailstock spindle, and; having a transverse guide with an adjustable arbor bearing slidably mounted in the guide for supporting the free end of the arbor.

'7. In a milling machine attachment for lathes, the combination with a lathe having .a bed, a headstockspindle' at one end of the bed, a tailstock spindle, and an adjustable carriage movably mounted on the bed, of a work supporting means mountable on and adjustable by the carriage, a cutter arbor revolubly supported on the bed on an axis parallel to the headstock spindle and operatively connected to the latter spindle,

and a bracket clamped to the tailstock spindle, and having a transverse guide with an adjustable arbor bearing slidably mounted in the guide for supporting the free end of the arbor.

8. In a milling machine attachment for lathes, the combination with a lathe having a bed, a headstock spindle at one end of the bed, a tailstock spindle, and an adjustable carriage movably mounted on the bed, of a Work supporting means mountable on and adjustable by the carriage, a cutter arbor revolubly supported on the bed on an axis parallel to the headstock spindle and operatively connected to the latter spindle, and a bracket supported with respect to the tailstock spindle, and slidably guided on the bed, and having a transverse guide with an adjustable arbor bearing slidably mounted in the guide for supporting the free end of the arbor.

9. In a milling machine attachment for lathes, the combination with a lathe having a bed, a headstock spindle at one end of the bed, and

i an adjustable carriage movably mounted on the bed, of a work supporting means mountable on and adjustable by the carriage, a bracket securable to the bed of the lathe between the headstock spindle and the carriage, a cutter supporting carriage vertically slidable on the bracket, means for vertically adjusting the latter carriage, a cutter arbor rigidly supported at one end and revolubly mounted on the latter carriage, means operatively connecting the cutter arbor to the headstock spindle in such a manner that the cutter arbor may be freely adjusted vertically, a second bracket supported on the bed at the side of the carriage opposite the first bracket, the second bracket havinga transverse guide with an adjustable arbor bearing slidably mounted in the guide for supporting the free end of the arbor, and a cutter on the cutter arbor for operating on the work supported on the lathe carriage.

10. In a milling machine attachment for lathes, the combination witha lathe having a bed, a headstock spindle at one end of the bed, and an adjustable carriage movably mounted on the bed, of a work supporting means mountable on and adjustable by the carriageya bracket securable to,,the bed of the lathe between the headstock spindle and the carriage, a cutter supporting carriage vertically slidable on the bracket, means for vertically adjusting the latter carriage, said carriage having a tapered-shank-receiving bore, a cutter arbor having a tapered shank fitting in said bore, said arbor beingthereby revolubly mounted on'the latter carriage, means operatively connecting the cutter arbor to the headstock spindle in-such a manner that the cutter arbor may be freely adjusted vertically, a second bracket,

supported on the bed at the side of the carriage opposite the first bracket, the second bracket having a transverse guide with an adjustable arbor bearing slidably mounted in the guide for supporting the free end of the arbor, and a "cutter on the cutter arbor for operating on the work supported on the lathe carriage.

11. In a milling machine attachment for lathes, the combination with a lathe having a bed, a

headstock spindle at one end of the bed, and an adjustable carriage movably mounted on the bed,

cutter arbor may be freely adjusted vertically, a

second bracket supported on the bed at the side of the carriage opposite the firstbracket, the second bracket having a transverse guide with an adjustable arbor bearing freely slidably mounted in the guide for receiving therein and for supporting the free end of the arbor, means for rigidly securing the bearing on the guide, and a cutter on the cutter arbor for operating on the work supported on the lathe carriage.

12. In a milling machine attachment for lathes, the combination with a lathe having a bed, a

headstock spindle at one end of the 'bed, and.

an adjustable carriage movablymounted on the bed, of a work supporting means mountable on and adjustable by the carriage, a bracket securable to the bed of' the lathe between the headstock spindle and the carriage, a cutter supporting carriage vertically slidable on the bracket, means for vertically adjusting the latter carriage, said carriage having a tapered-shank-receiving bore, a cutter arbor 'having a tapered shank fitting in said bore, said arbor being thereby revolubly mounted on the latter carriage, means operatively connecting the cutter arbor to the headstock spindle in such a manner that the cutter arbor may be freely adjusted vertically, a second bracket supported on the bed at the sideof the carriage opposite the first bracket,

the second bracket having a transverse guide with an adjustable arbor bearing freely slidably mounted in the guide for receiving therein and for supporting the free end of the arbor, means for rigidly securing the bearing on the guide, and a 'butter on the cutter arbor for operating on the work supported on the lathe carriage.

13. In combination with a lathe having a bed, a headstock mounted thereon and a drive spindle rotatably carried by the headstock, a milling device comprised of a body mounted on the bed, a carriage mounted on the body, a tool carrying spindle journalled in the carriage on a longitudinal ain's parallel to that of the drive spindle,

said carriage being slidably mounted on the body to the .countershaft, and means operatively connecting the countershaft to the tool carrying spindle. v

aavoneo 5 14. m a milling machine attachment for lath the combination with a lathe having a bed, a

' headstock spindle at one end of the bed, a bracket secura ble to the bed of thelathe adjacent the headstock spindle, a cutter carriage vertically slidabie on the bracket, means for vertically adjusting the latter carriage, a cutter spindle revolubly mounted on the latter carriage and positioned parallel to the headstock spindle, a sheave on the headstock spindle, a sheave on one end 01' 19 'the cutter spindle, a counter shaft carrying a pair of sheaves and also positioned.- parallel to the headstock spindle, a belt connecting one 01' said pair of sheaves with the headstock spindle sheave, a second belt connecting the other of said I pair of sheaves with the cutter spindle sheave,-

an idler sheave for tightening the latter belt, and

a cutter on the cutter spindle for operating on the work supported on the lathe carriage.

WILLARD C. HUNQERFORD. 

